Bag forming process



paper, cellophane", and the like, and also to the Patented Nov. 1, 1938 UNITED STATES PATENT OFF-ICE f 2,135,132 BAG rommvc raocass Spencer-B. Boehmer, (lien Ellyn, 111. Application June so, 193v, semi Nb. 151,076

2 Claims.

This invention relates to processes for forming bags or containers of flexible material, such as structure of the bags. A particular object is to provide such a bag so formed that it may be sealed when filled with the substance which it is to contain,, and then may be conveniently openedand again sealed, so that some of the substance may be removedand the remainder may be fully protected from exposure to the air, by again sealing the bag.

Of the accompanying drawing Fig. 1 is an elevation of the mandrel which I provide; Fig. 2 isan end view of the mandrel; Fig. 3 is an elevation of the mandrel with the bag material thereon in the process of forming; Fig. 4 is an end view of the same; Fig. 5 is a longitudinal sectional view of the same; Fig. 6 is an elevation of the bag with one end closed and with the mandrel removed therefrom: and Fig. 'I isa similar viewwith the other end of the bag closed.

The mandrel consists of a tube ll of any suit- -abl e material, preferably material having a smooth outer surface. The outside diameter of the tube is chosen as substantially the same as the inner diameter of the bag when finished. In one end of the tube is slipped another tube ll, so

that the outer end of the inner tubervill project from the main tube a suitable distance, preferably one half inch .or more. tubes are fastened together in any suitable manner, either by forcing the inner tube in the outer one, or by soldering, or otherwise. 'While I prefer this method of forming the mandrel, yet it may beformed by merely turning down theend of the main tube so as to form a circumrerentially inwardly oirset portion with the shoulder II a suitable distance from the end. This distance, however, may be varied at pleasure, depending on the needs.

In forming the bag, a collar 9, of any suitable material, but of material of suitable rigidity, is removably positioned on the projecting end of the tube II, the thickness of the collar preferably being'such as to bring the outer surface sub-;

J stantially iiush with the outer surface of the main tube.

A sheet of the material of which the bag is to I be formed is then wrapped around the mandrel and collar, so as to form the-tubular member I:

with its edge l4 projecting a material distance beyond the outer end ofthe collar 9. The end ll of the bag material is then twisted and then turned inwardly within the collar, so as to substantially seal that end of the bag; and the bag, including the collar, is then slipped from the her and the collar, and so that the'tubular member projects a. material distance mandrel. If desired, the outers'urface of the collar may be coated with adhesive material so that it will be permanently fastened to the bag when'it is completed. To assist in removing the mandrel the unsealed end of the bagv is formed a materialdistanee inwardly from the end i5-of the mandrel, so that this portion of themandrel may be grasped as thebag is being removed.

When the bag is thus removed from the mandrel, it may be filled with any desired substance, such as candy, soup pellets, or the like,

, and the end ll of the bag then may be permaterial, such as paper or cellophane, or even I of metal foil. The collar, however, should be formed of stiff material so as to retain 'its shape collar may be permanently fixed to the bag material, or it may be movable therein. In the lattercase-it may be shoved inwardly more .and

more as the contained substance is removed, so. as to maintaina filled condition of the bag at all I times. The collarjnot only forms a means for allowing the end of the bag to 'be twisted and forced within the collar, and for holding t bag I 'as the end is forced therein or pulled out. The

end in shape, but it also formsa rigid and suitable bottom for improving the appearance of the bag and for a base on which the bag may rest, if

' that is desired.

'1 claim as my invention 1. A process for forming a bag. consisting in mounting a. bagcollar removably on one end-of anelongated tubular member, in then wrapping a sheet of bag material around the tubular member and the collar so that one edge of the sheetprojects a material distance beyond the tubular menibeyond the sheet edge adjacent that end, and then twisting. and forcing the projecting edge of the sheet into the collar, and in then removing the tubular member from the sheet and the collar,

1 leaving the collar in the bag thus formed as a part thereof.

2. A process for forming a bag consisting in mounting a tubular member on one end of a-.

mandrel, in then placing a piece of bag material the otherv end of around the mandrel and the tubular member so that one edge of the piece projects a material distance beyond the mandrel and the tubular member, and so that the other end of the mandrel projects a material distance beyond the piece of bag material, and in then twisting and forcing the projecting piece edge inwardly, and in then removing the mandrel from the bag material piece and the tubular member, leaving the tubular member in the bag thus formed as 'a part thereof.

SPENCER U. BOEH'MER. 

